diff --git a/libs/vkd3d/meta.c b/libs/vkd3d/meta.c
index c714988b..745b28a6 100644
--- a/libs/vkd3d/meta.c
+++ b/libs/vkd3d/meta.c
@@ -605,7 +605,7 @@ static HRESULT vkd3d_meta_create_copy_image_pipeline(struct vkd3d_meta_ops *meta
 
     struct spec_data
     {
-        uint32_t mode;
+        enum vkd3d_meta_copy_mode mode;
     } spec_data;
 
     static const VkSpecializationMapEntry map_entries[] =
diff --git a/libs/vkd3d/vkd3d_shaders.h b/libs/vkd3d/vkd3d_shaders.h
index 6abaecc8..4c0a21f4 100644
--- a/libs/vkd3d/vkd3d_shaders.h
+++ b/libs/vkd3d/vkd3d_shaders.h
@@ -19,9 +19,14 @@
 #ifndef __VKD3D_SPV_SHADERS_H
 #define __VKD3D_SPV_SHADERS_H
 
-#define VKD3D_META_COPY_MODE_1D (0)
-#define VKD3D_META_COPY_MODE_2D (1)
-#define VKD3D_META_COPY_MODE_MS (2)
+enum vkd3d_meta_copy_mode
+{
+    VKD3D_META_COPY_MODE_1D = 0,
+    VKD3D_META_COPY_MODE_2D = 1,
+    VKD3D_META_COPY_MODE_MS = 2,
+
+    VKD3D_FORCE_32_BIT_ENUM(VKD3D_META_COPY_MODE),
+};
 
 #include <cs_clear_uav_buffer_float.h>
 #include <cs_clear_uav_buffer_uint.h>